Ignition-furnace for sintering-machines.



F. W. YOST 6:. B. G. KLUGH.

IGNITION FURNACE FOR SINTERING MACHINES. APPLICATION FILED mm. H. ms.

1,206,397. Patented Nov. 28, I916.

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F. W. YOST 64 B. G. KLUGII. IGNITION FURNACE FOR SINTERING MACHINES.

APPLICATION FILED NA]. ll. l9l5. 1,206,397. Patented Nov. 28, 1916.

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Patented Nov. 28, 1916.

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Patented Nov. 28, 1916.

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with an air supply pipe. Both the gas and air are preferably supplied under pressure. When using blast furnace gas, we refer to supply both the air and the gas to tie mixer 5 at pressures from two to three times as great as when natural gas, coke oven gas, or illuminating gas are employed. 8 is a valved pipe leading into another mixer 9 in the ipe connection 7, and which may be emp oyed, when desired, to supply a richer gas for admixture with the lean as. This may or may not be used. We pre er to employ it, however, since it not only provides means for enrichment of-the blast furnace gas when necessary, but also aflords an inependcnt source of suppl of gas for the furnace in case of any fai are of the blast furnace gas.

The mixer 5 has a pipe connection 10 with a distributin chamber, which is shown as consisting 0 an u per section 11 and a lower section 12. itted between these two sections is a diaphragm 13 which serves as a distributing plate and which is provided with a luraht of holes or perforations 14. Fitted in the ottom of the lower section 12 are a plurality of burner orifices or nozzles 15. which are spaced in such relation to each other that the flame, as develo ed when it reaches the upper surface of tie sintering charge 4, forms a practically continuous line of flame from one side of the charge to the other. The holes in the distributin plate 13 are so proportioned and locate with reference to the burner nozzles 15 that the nozzles near each side of the charge secure a due roportion of the gas, to prevent a hot ignition flame at the center of the charge and a weak ignition flame at the side portions thereof.

16 is a combustion chamber which is placed below the distributing chamber and its burner nozzles. This combustion chamber has a fire-brick lining 17 which practically fills the chamber, except that where the two sections of the lining are abutted at the center of the chamber they are cut away to form a pluralit of vertical openings or passages 18 which lead downwardly into a combustion s ace 19 of inverted form. The princip function of this combustion chamber is to store up heat in its brick lining so as to maintain the combustion of the gas at a suflicientlv high temperature. On this account, the combustion s nos 19 is made as small as possible and t is side walls are brought near to each other so that the row of gas jets burn in close proximity to the highly heatedsides of the chamber.

The i nition furnace as a whole is supported y hangers 20 which are rovided with suitable adjustin means, sum as tho turnlmckles 21. The listributing chamber is supported above the combustion chamber by the adjusting bolts and nuts 22. The adjustable hangers 20 permit of varyin the distance between the upper surface 0 the sinterin charge 4 and the lower surface of the com ustion chamber. In the construction shown in Figs. 1 and 2 the pallet 2 is shown as having relatively deep sides which project above the lower surface of the comustion chamber 16, this illustrating the use of the ignition furnace where the sintermg charge varies through a considerable range of depth and occupies ordinarily only a portion of the total depth of the pallet.

It is at all times desirable to space the combustion chamber as close to the upper surface of the charge as conditions will permit, so as to reduce the volume of cold air drawn into the charge along with the ignition flame, in order to maintain the ignition at the highest temperature possible. For materials that lie quiesccntly during the ignition period there need be provided only a mechanical clearance between the lower edge of the combustion chamber and the upper surface of the sinterin charge. When materials are sintered whici contain an appreciable amount of combined water, particles of the sintering charge decrepit-ate and are thrown in contact with the heated surface of the combustion chamber if the minimum clearance is employed.

By means of the adjustable connections .22 the quantity of secondary combustion air entering the combustion chamber between the distributing and combustion chambersma be controlled as may be desired.

he two gas supply connections 6 and 8 rovide means wiereby in case the blast urnace gas is insuflicient in quantity or is too loan in quality a shift can readilv be made to the other source bf supply. arying proportions of both gases can be used, both supply pipes being provided with valves so that the su ply of either gas can be shut off or the desired proportion of each used.

Figs. 2, 4, and 5 show substantially the same general construction as Fig. 1, and corresponding reference characters are applied to similar arts, with the letter (I. added. In Figs. 2 and -l we have, however, omitted the mixing chamber 5 and the lean gas supply pipe 6, and have shown a single mixer 9" having an air supply pipe connection 7" and a gas supply pipe connection 8, the mixer 9" being connected directly to the distributing chamber. This construction is particularly adapted for use with rich gases such as i luminating or coke oven gas. As shown in Figs. 2 and 5 the relation of the distributing chamber to the combustion chamber is that which is adapted for use of a relatively rich gas, where a portion of the air required for com lete com mstion is an plied to the mixer 2 and the remainder oi the combustion' air is supplied to the top of the combustion chamber through the. injector action of the burner nozzles. In using blast furnace or producer gas the lower surface of the distributing chamber should be in tight contact with the upper surface of the combustion chamber and the joint made. as nearly air-tight as pomible to prevent air being drawn in at this point.

Fig. 3 shows a construction especially adapted for the use of oil or tar as the ignition fuel. Parts in this fi me which correspond to similar parts in ig. 1 are 'ven the same reference numeral with the etter I) added. We have in this figure shown a sh htly different form of pallet in which the pa let sides 26 are of less depth than in the preceding figures and do not project above the lower surface of the combustion chamber. In this figure, 27 designates the fuel supply pipe having the atomizing nozzle 28 arran ed above a retort 29 which is secured to t e upper section of the distributing chamber. This retort has a firebrick lining 30, and is designed to burn the fuel oil or tar which is sprayed therein with slightly less air than is needed for complete combustion. This retort is maintained at a bright red temperature, which fixes the atomized oil in its partly burned condition into a fairly stable gas.

It will be readil seen that not only any one of the several orms of fuel supply connections illustrated may be readily attached to the same distributor without any change in the latter, but that, in fact, any other suitable fuel supply arrangement may be connected thereto, as may be desired in any particular case to make a quick change from one kind of fuel to another.

Our invention is distinguished from the ignition furnaces used in the prior practice of sintcring in the following respects: The apparatus is interchangeable for use with various kinds of gaseous fuels. It is adaptable with slight alterations for burning fuel oil or tar by generating fuel gas in an integral part of the apparatus. It burns lean gas in small jets placed at close intervals, so that a line of flame of uniform intensity can be extended across the full width of the sintering charge. Relatively high pressures are employed for both as and air supply, and close regulation of )oth gas and air supply is possible so as to obtain very thorough mixing, and to permit the efficient burning of a lean gas such as blast furnace gas or producer gas. The combustion chamber is of restricted volume. with side walls near each other and maintained at a. relatively high temperature so as to be able to continuously ignite lean gas mixtures and to burn such mixtures at a temperature above normal, and avoiding the usual great flame expansion with consequent drop in temperjustable for any Marc, thus producing hi h temperature ignition. By reason of tie distributing plate interposed in the distributing chamber with its plurality of spaced and properly positioned holes, the supply of gas mixture is uniformlv divided among the burner nozzles so as to obtain a practically unbroken line of flame of uniform intensity across the full width of the sintering charge. This distributing plate, together with the lower distributing chamber,'also acts as a supplementary mixer for the gas and air, because of the throttling action of the small holes in said plate.

The ignition furnace as a whole is perfectly adjustable with respect to the upper surface of sintering charges of various depths, and the burner nozzles may also be adjusted with relation to the top of the combustion chamber so as to secure accurate control of the secondary air passing into the top of the combustion chamber.

The arrangement shown in Fig. 1 includes a mixer for lean gas. such as blast furnace gas. which is so connected with a mixer for fuel gas higher in heat units, that either gas may be used alone or a mixture of both gases may be used.

The'apparatus as a whole is adaptable for use with any kind of fluid fuel, and is addepth of sintering charge, or for any character of flame required.

Various changes may be made in the details of construction and arrangement of the several parts without departing from the spirit and scope of our invention as defined in the appended claims.

We claim:

1. An ignition furnace for sintering apparatus, having a combustion chamber and an interchangeable fluid fuel supply, substantially as described.

2. An ignition furnace for sintering apparatus, having a combustion chamber, supply connections leading to different sources of gas supply, and controlling means whereby either source of supply may be used independently of the other, or a proper mixture of both may he used, substantiallv as described. '7

3. An ignition furnace for sintering apparatus, having a combustion chamber and a detachable and interchangeable fluid fuel supply system, substantial y as described.

4. n ignition furnace for sintering apparatus, having a combustion chamber, a distributing chamber formed with a transverse perforated distributing element. and a plurality of burner orifices below said element above the combustion chamber. substantially as described.

5. An ignition furnace for sintering apparatus, comprising a distributing chamber paratus, comprising a .ated

. space ply system connected thereto above the Plate or diaphragm, and a series of burner orifices or nozzles below said plate or diaphragm, substantially as described.

6. An ignition furnace or sinterin apdistributing 0 amher having a transversely arranged distributing plate, a fuel su ply connection above said ate, and the ower portion of said cham er havinga luralit of spaced burner nozzles, substantia 1y as escribed.

7. An ignition furnace for sintering apparatus, comprising a distributing chamber iavingl a fue suppl connection a perforistributing p ate or diaphragm arranged transversely of said chamber, and a series of burner nozzles leadin from the lower portion of said chamber, t e holes in said (plate and the burner nozzles being and arranged to cause the supply of fuel mixture to be uniformly div: ed amon the nozzles to obtain a practically unbro on line of flame of substantially uniform intensity across the full width of the sintering char e, substantially as described.

8. An ignition furnace for sintering apparatus, comprising a combustion chamber iavinlg diver-gin walls, a burner having a ity of sum 1 jets arranged at close intervals, whereby a line of flame can be extended across the full length of the combustion chamber, there being an opening for each of said jets leading to the combustion chamber; substantially as described.

9. An ignition furnace for sintering apparatus, com rising a combustion chamber avin a re ractory lininghaving an inverte V-shaped combustion space within its lower ortion and having a plurality of relative y email passages eading from its upper surface into said space, substantially as described.

10. An ignition furnace for sintering apparatus, comprisin a fuel distributing chamber, a combustion chamber below the distributing chamber, and means for simultaneously adjusting said chambers vertically with respect to the sintering charge, substantially as described.

11. An ignition furnace for sinterin apparatus, comprising a distributing 0 amer, a combustion chamber below the distributing chamber, and means for vertically adjusting said chambers with respect to the sintering charge, together with means for also adjustin the relation between the distributing c amber and the combustion chamber, substantially as described.

12. An ignition furnace for sinterin aparatus, comprising a distributin 0 amer and a combustion chamber, sald chambers being adjustable toward and away from each other, substantially as described.

13. An ignition furnace for sintering apparatus, comprising a fuel distributing plura 1,soe,se7 I chamber having a plurality of burner nozzles spaced at close intervals, and a combustion chamber below said nozzles and having a restricted combustion s ace there being an opening for each nozz e leading to said space, substantially as described.

14. An ignition furnace for slntering apparatus, comprising a combustion chamber having a refractory lining or filling formed with a. restricted combustion space whose lateral walls diverge downwardly, substantially as described.

15. An ignition furnace for sintering apparatus comprising a combustion chamber aving a refractory lining or filling formed with a restricted combustion space whose lateral walls diverge downwardly, said space extending partly through the filling or lining from the bottom, and the lining having passages leading into the upper portion of said space, substantially as described.

16. An ignition furnace for sintering apparatus having an air and gas mixer connected to a source of lean gas supply, another mixer connected to the first named mixer and also with a source of relatively rich gas supply, substantially as described.

17. An ignitlon furnace for sintering apparatus, having an air and gas mixer connected to a source of relatively rich gas supply, and another mixer connected to the first named mixer and also with a source of lean gas supply, together with control means whereby either or both sources of supply may be used, substantially as described.

.18. An ignition furnace for sintering apparatus, comprising an air and gas mixer connected with a source of lean gas supply, and another air and gas mixer connected in series with the first air and gas mixer, and having a connection with another and different source of gas supply, substantially as described.

19. An ignition furnace for sintering apparatus, com rising a distributin chamber provided wit 1 a p urality of sma 1 jets arranged at close intervals, and a combustion chamber having a contracted combustion space and whereby it is maintained at a high temperature, there being an opening for each jet leading to the combustion chamber, substantially as described.

20. An ignition furnace forsintering apparatus, comprising a burner provided with a plurality of small jets arranged at close intervals, and a combustion chamber with a contracted combustion s ace whereby an ignition temperature for can gas mixtures is maintained and in which a flame can be maintained over the entire combustion chamber above the sintering charge, substantially as described.

21. An ignition furnace for sintering apparatus, comprising a burner havin a plurahty of small jets arranged at e ose inand tervals, a combustion chamber with a contracted combustion space and adapted to be maintained at a high temperature, and means for adjusting the burner and the com- 5 bastion chamber in air tight relation to each other, whereby a line of flame generated from lean as can be extended across the full width 0% the sintering charge, substantially as described.

10 22. An ignition furnace for sintering apparatus, com rising a burner having a plurality of sma 1 jets arran ed at close intervals, a combustion cham er with a contracted combustion space and adapted to be 15 maintained at a high tem erature and controlling means for close y reguiating the supply of secondary combustion air whereby a ine of flame generated from him gas can be maintained across the full width of the sintering charge, substantially as de- 20 scribed.

In testimony whereof, we have hereunto set our hands.

FREDERICK W. YOST. BETHUNE G. KLUGH.

Witnesses as to Frederick W. Yost:

W. B. WIDENAYER, WALTER S. REED.

\Vitnesses as to Bethune G. Klugh:

PAUL S. Jormson, MARGARET B. FLOYD.

Copies of this patent may be obtained for a" cents each, by addressing the Commissioner of ratents, Washington, D. 0. 

